Personally, I think being gay is somewhat of a mix between how you were brought up/your early age enviroment and a choice. I haven't seen any firm studies showing that homosexuality can be linked to genetics, and that leads me to believe the former. What do you think?

If it was entirely environmental, you'd get not as many closeted, frightened folks from intolerant places (the Sout') as you do. The environment is harder to study for, though. It's true that there are far more queers in cities, and that's not just because of uban/suburban migration patterns.

Still, it's based on who people are. So 80% nature, 20% nurture is a safe bet.